BQ29312PWR

Product Overview

Category

BQ29312PWR belongs to the category of integrated circuits (ICs) used in battery protection and monitoring systems.

Use

This IC is primarily used for protecting and monitoring lithium-ion and lithium-polymer batteries in various electronic devices, such as smartphones, tablets, laptops, power banks, and electric vehicles.

Characteristics

• Battery protection: The BQ29312PWR provides overvoltage, undervoltage, and overcurrent protection for lithium-ion and lithium-polymer batteries.
• Cell balancing: It supports cell balancing functionality, ensuring that each cell within a battery pack is charged and discharged evenly.
• Temperature monitoring: The IC includes temperature sensors to monitor the battery's temperature and prevent overheating.
• Fault detection: It can detect and report faults such as short circuits, reverse polarity, and abnormal voltage levels.

Package and Quantity

The BQ29312PWR is available in a small outline integrated circuit (SOIC) package. It is typically sold in reels containing a specified quantity, usually 250 or 300 units per reel.

Specifications

• Input voltage range: 2.5V to 26V
• Operating temperature range: -40°C to +85°C
• Number of cells supported: Up to 4 series-connected lithium-ion or lithium-polymer cells
• Cell balancing current: Up to 100mA per cell
• Overvoltage protection threshold: Configurable between 3.0V and 4.6V per cell
• Undervoltage protection threshold: Configurable between 1.8V and 3.0V per cell
• Overcurrent protection threshold: Configurable between 10mA and 80mA

Pin Configuration

The BQ29312PWR has a total of 16 pins. The pin configuration is as follows:

1. VDD: Power supply input
2. GND: Ground reference
3. SDA: Serial data input/output for communication
4. SCL: Serial clock input for communication
5. ALERT: Open-drain output for fault indication
6. CPOUT: Charge pump output for cell balancing
7. CBAT: Cell balancing control input
8. BAT1: Battery pack positive terminal connection
9. BAT2: Battery pack positive terminal connection
10. BAT3: Battery pack positive terminal connection
11. BAT4: Battery pack positive terminal connection
12. TS1: Temperature sensor input for cell 1
13. TS2: Temperature sensor input for cell 2
14. TS3: Temperature sensor input for cell 3
15. TS4: Temperature sensor input for cell 4
16. VSS: Ground reference

Functional Features

• Overvoltage protection: The BQ29312PWR monitors the voltage of each cell and disconnects the battery from the load when the voltage exceeds the configured threshold.
• Undervoltage protection: It prevents excessive discharge of the battery by disconnecting it from the load when the voltage drops below the configured threshold.
• Overcurrent protection: The IC limits the current flowing through the battery to prevent damage caused by excessive current.
• Cell balancing: It equalizes the charge levels of individual cells within a battery pack, improving overall battery performance and lifespan.
• Temperature monitoring: The IC measures the temperature of each cell to prevent overheating and potential safety hazards.

Advantages and Disadvantages

Advantages

• Comprehensive protection: The BQ29312PWR offers multiple protection features, ensuring the safety and longevity of lithium-ion and lithium-polymer batteries.
• Cell balancing capability: It supports cell balancing, which optimizes battery performance and extends its lifespan.
• Configurability: The IC allows users to adjust various protection thresholds and parameters to suit specific battery requirements.

Disadvantages

• Limited cell count: The BQ29312PWR supports a maximum of 4 series-connected cells, which may not be sufficient for applications requiring higher cell counts.
• External components required: To utilize all the features of this IC, additional external components such as resistors, capacitors, and temperature sensors may be necessary.

Working Principles

The BQ29312PWR operates by continuously monitoring the voltage levels of each cell in the battery pack. It compares these voltages with the configured thresholds for overvoltage and undervoltage protection. If any cell's voltage exceeds or falls below the set limits, the IC takes appropriate action to disconnect the battery from the load. Additionally, it measures the temperature of each cell using the built-in temperature sensors and triggers protective measures if the temperature rises above a safe threshold.

Application Field Plans

The BQ29312PWR is widely used in various applications that require battery protection and monitoring. Some of the key application fields include: - Portable electronic devices: Smartphones, tablets,